C63 tune question?
what i want to know is should i just tune it and replace exhaust on it and drive it with the same headbolts or should i replace the headbolts first?
the thing is if its not nessecery to replace the headbolts i dont want to do it, its like the saying goes if its not broke dont fix it.
what are your opinions on this? is it really important to replace headbolts or should i just go on with the tune and aftermarket stuff?


